fluorescence spectroscopy Articles
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Removal of ammonium from aqueous solution by three modified molecular sieves: a comparative study
Molecular sieves (Ms) modified either by treatment with a NaCl solution, or by microwave treatment, or by both NaCl and microwave treatment were employed to promote the removal of ammonium from aqueous solution. Parameters such as NaCl concentration, NaCl stirring time, microwave power and microwave irradiation time were optimized with respect to ammonium removal. The specific surface area, ...
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Characterizing natural dissolved organic matter in a freshly submerged catchment (Three Gorges Dam, China) using UV absorption, fluorescence spectroscopy and PARAFAC
This study applied parallel factor analysis (PARAFAC) to fluorescence excitation–emission matrices (EEMs) of natural water samples in a freshly submerged catchment in the upper reach of Three Gorges Dam (China). Two fluorescent natural dissolved organic matter (NDOM) components (humic/fulvic-like) were uncovered and were positively correlated with selected water quality parameters, i.e. dissolved ...
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Benefits of the Nieka Fusion Fluxer | Spectroscopy Guides
Specac have long been involved with presses and dies that we have supplied into the XRF analysis market for pressed pellet sample preparation; joining up with Nieka who are based in Canada is a natural extension and one we are proud to achieve. Nieka produce the Fusion Fluxer, a leading tool for preparing sample fusion beads for XRF analysis. Both pressed pellets and fusion beads have an ...
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Assessment of carbon nanotubes and silver nanoparticles loaded clays as adsorbents for removal of bacterial contaminants from water sources
This work evaluated the antimicrobial efficacy of kaolin clay and its loaded forms with carbon nanotubes (CNTs) and silver nanoparticles (AgNPs) against bacterial isolates from different water supplies (tap, underground and surface water) in addition to wastewater. A total of 160 water samples were collected from different water sources in the investigated districts. Samples were cultured for ...
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Transformation of dissolved organic matter by oxidative polymerization with horseradish peroxidase
Dissolved organic matter (DOM) has significant influence on the transport and fate of contaminants in multiple phases and it has potential hazard by acting as a precursor of disinfection by-products in water supply. The changes in DOM characteristics, especially by oxidative polymerization might result in different behaviour in the interaction with many contaminants. The aim of this work was to ...
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Using the EA8000 X-Ray analyser to improve lithium ion battery performance and reliability
The EA8000 X-Ray Particle Contaminant Analyser is designed to help lithium ion battery (LiB) manufacturers improve the safety, performance and yield of their product. The analyser is engineered to rapidly detect and analyse unwanted metal particles within the battery. These particles are known to cause sudden catastrophic failure of the batteries, often accompanied by fire or explosion. The ...
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We analyzed cement using XRF | Spectroscopy Solutions
The X-Ray Fluorescence (XRF) spectroscopic analysis of cement samples usually requires XRF pellet preparation using a hydraulic laboratory press such as the Atlas Manual Hydraulic Press and a powerful sample-grinding mill such as the P6 Planetary Ball Mill. XRF analysis of cement application note We have published a brand new application note on the analysis of cement using X-ray Fluorescence ...
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Real-time sensing of bioaerosols: Review and current perspectives
Abstract Detection of bioaerosols, or primary biological aerosol particles (PBAPs), has become increasingly important for a wide variety of research communities and scientific questions. In particular, real-time (RT) techniques for autonomous, online detection and characterization of PBAP properties in both outdoor and indoor environments are becoming more commonplace and have opened avenues of ...
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Edinburgh Instruments Spectroscopy Instrumentation Overview
Edinburgh Instruments is a world-leader in both single photon counting and time-correlated single photon counting (TCSPC) based fluorescence Spectroscopy Instrumentation in addition to Raman Spectroscopy Instrumentation.We are recognised internationally as a company that offers maximum flexibility and exceptional quality in both instrumentation and services. We understand that choosing the right ...
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Transformation characteristics of organic pollutants in Fered-Fenton process for dry-spun acrylic fiber wastewater treatment
The Fered-Fenton process using Ti sheet as cathode and RuO2/Ti as anode was employed for the pretreatment of dry-spun acrylic fiber manufacturing wastewater. The effects of feeding mode and concentration of H2O2 on chemical oxygen demand (COD) removal efficiency as well as the biodegradability variation during the Fered-Fenton process were investigated. The feeding mode of H2O2 had significant ...
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What is X-ray powder? | Spectroscopy Guides
What is XRF powder? Spectroscopy is an analytical technique used in diverse industries for sample characterisation, quality control, and contaminant detection. X-ray fluorescence spectroscopy (XRF) involves shining bright X-rays at a sample and measuring how much light is emitted, revealing its elemental makeup. This fundamental technique can quickly show manufacturers how pure their steel is ...
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Binding interactions of 1‐naphthol with dissolved organic matter of Lake Biwa and treated sewage wastewater: The role of microbial fulvic acid
The binding interactions of 1‐naphthol with effluent and whole natural dissolved organic matter (DOM) samples were analyzed by using a fluorescence quenching technique. Nonfractionated DOM samples from Lake Biwa (Japan), creek water, treated sewage effluents, and an extracted Lake Biwa fulvic acid (LBFA) standard were used as quenchers and compared at the same 1‐naphthol with DOM organic carbon ...
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Monitoring the fate of fluorescing substances recycled in ultrafiltration process backwash water
The fate of fluorescing substances during the recycling of membrane backwash water (MBWW) ahead of coagulation, flocculation and sedimentation (CFS) with ultrafiltration (UF) membranes has been investigated. Bench-scale UF membranes were used to generate MBWW from a CFS-treated surface water containing 21 mg/L dissolved organic carbon (DOC) registering a 0.95 cm–1 UV254 absorbance that had ...
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XRF Sample Preparation Techniques: Pellets versus Loose Powder | Spectroscopy Guides
We recently compared the effectiveness of loose powder against prepared pellets for the x-ray fluorescent spectroscopic analysis of cement. Some users choose to carry out XRF without pressing the sample into a pellet. Despite the extra time involved in sample pellet preparation, which involves the use of a hydraulic laboratory press, our results show the importance of preparing high quality XRF ...
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Examination of Pb2+ bio-sorption onto
Rhodotorula mucilaginosa using response surface methodologyWith the rapid industrial development, wastewater has been a risk for environmental contamination. We aimed to explore the optimum condition and mechanism of Pb2+ bio-sorption onto Rhodotorula mucilaginosa WT6-5. Optimization of initial concentration of Pb2+, initial pH, and adsorption time for Pb2+ bio-sorption onto R. mucilaginosa WT6-5 was performed using response ...
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Space Spectrometers: Spectroscopy in Space
National Space Day is celebrated annually in the US on the first Friday of May. The celebration was created to promote STEM amongst young people.1 However, it also offers an opportunity for the public to celebrate the extraordinary achievements and opportunities space exploration provides. Here at Edinburgh Instruments, we are celebrating National Space Day by highlighting how spectroscopy can ...
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What is a Spectrometer?
In the broadest sense a spectrometer is any instrument that is used to measure the variation of a physical characteristic over a given range; i.e. a spectrum. This could be a mass-to-charge ratio spectrum in the case of a mass spectrometer, the variation of nuclear resonant frequencies in an NMR spectrometer or the change in the absorption and emission of light with wavelength in an optical ...
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Fouling analysis of polysulfone ultrafiltration membranes used for drinking water treatment
Natural organic matter (NOM) plays a significant role in the fouling of ultrafiltration membranes in drinking water treatment processes. For a better understanding of the interaction between fractional components of NOM and polysulfone (PS) ultrafiltration membranes used for drinking water treatment, fouling and especially the physically irreversible fouling of natural organic matter were ...
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What is Resonance Raman Spectroscopy?
Resonance Raman spectroscopy is a Raman enhancement technique in which the laser excitation frequency is chosen to be close to the frequency of an electronic transition of the sample. Resonance Raman can enhance the Raman scattering intensity by a factor of 102-106 and improves signal-to-noise. The enhanced Raman scattering means shorter exposure times can be used, allowing much faster spectral ...
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What is Quantum Yield?
The IUPAC definition of quantum yield (Φ) is the number of a certain event occurring per photon absorbed by the system.1However, it is most commonly written specifically for the emission of light (photoluminescence) by a system2-5 This narrower definition is often simply called quantum yield; with the emission of light being implicit given the context. However, the terms fluorescence, ...
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